Heat and Thermodynamics MCQ question and answer with solution

31

The atmosphere is heated mainly by

A) isolation B) conduction C) radiation D) convection

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Answer & Solution

Answer: Option C

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32

Which of the following is correct?
Specific volume of water when heated at 0 Celsius

A) First increases and then decreases B) First decreases and then increases C) Grows equally D) Decreases evenly

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Answer & Solution

Answer: Option B

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33

The water from a hand pump is warm in winter because

A) our body is cold in winter and the water appears to be warm B) the temperature inside the Earth is higher than the atmospheric temperature C) the pumping process causes friction which warms up the water D) inside water comes out and absorbs heat from the environment

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Answer & Solution

Answer: Option B

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34

A hydrogen inflated polythene balloon is released from the surface of the Earth. As the balloon rises to an altitude up in the atmosphere, it will

A) Decrease in size B) Flatten into disc like shape C) Increase in size D) Maintain the same size and shape

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Answer & Solution

Answer: Option C

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35

Super cooling stands for cooling of a liquid

A) at freezing point B) below freezing point C) at melting point D) above melting point

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Answer & Solution

Answer: Option B

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36

Consider the following statements.
Assertion (A): Light coloured clothes are preferred in summer.
Reason(R): Light colours are poor absorbers of heat.
Select correct answer:

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer & Solution

Answer: Option A

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37

Burns caused by steam are much severe than those caused by boiling water because

A) steam pierces through the pores of body quickly B) steam has latent heat C) steam is gas and engulfs the body quickly D) temperature of steam is higher

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Answer & Solution

Answer: Option B

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38

Which of the following represents a relation for heat lost = heat gained?

A) Principle of Thermal equilibrium B) Principle of Colours C) Principle of Calorimetry D) Principle of Vaporisation

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Answer & Solution

Answer: Option C

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39

If thermal capacity of a body is expressed in terms of mass of water is called

A) specific heat B) water equivalent C) latent heat D) None of the above

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Answer & Solution

Answer: Option B

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40

Green house effect is the heating up of the Earth's atmosphere which is due to

A) the ultraviolet rays B) γ-rays C) the infrared rays D) X-rays

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Answer & Solution

Answer: Option C

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Heat and Thermodynamics MCQ question and answer with solution | Physics Gk MCQs